Tool
No.1 Most Common Ports
Port Number/Layer Name Description
1tcpmuxTCP Port Service Multiplexer
5rjeRemote Job Entry
7echoEcho Service
9discardEmpty service for connection testing
11systatSystem status that lists connected ports
13daytimeSends date and time to the requesting host
17qotdSends a daily quote to the connected host
18mspMessage Send Protocol
19chargenCharacter generator service; sends an endless stream of characters
20ftp-dataFTP Data Port
21ftpFile Transfer Protocol (FTP) port; sometimes used by the File Service Protocol (FSP)
22sshSecure Shell (SSH) service
23telnetTelnet service
25smtpSimple Mail Transfer Protocol (SMTP)
37timeTime protocol
39rlpResource Location Protocol
42nameserverInternet Name Service
43nicnameWHOIS Directory Service
49tacacsTerminal Access Controller Access-Control System for TCP/IP-based authentication and access
50re-mail-ckRemote Mail Check Protocol
53domainDomain Name Service (e.g., BIND)
63whois++WHOIS++ (an extended version of WHOIS)
67bootpsBootstrap Protocol (BOOTP) Service; also used by Dynamic Host Configuration Protocol (DHCP) service
68bootpcBootstrap Client (BOOTP); also used by Dynamic Host Configuration Protocol (DHCP) Client
69tftpTrivial File Transfer Protocol (TFTP)
70gopherGopher Internet Document Search and Retrieval
71netrjs-1Remote Job Service
72netrjs-2Remote Job Service
73netrjs-3Remote Job Service
73netrjs-4Remote Job Service
79fingerFinger service for user contact information
80httpHypertext Transfer Protocol (HTTP) for World Wide Web (WWW) services
88kerberosKerberos Network Authentication System
95supdupTelnet protocol extension
101hostnameHostname Service on SRI-NIC machine
102iso-tsapISO Development Environment (ISODE) network application
105csnet-nsMailbox Name Server; also used by CSO Name Server
107rtelnetRemote Telnet
109pop2Post Office Protocol version 2 (POP2)
110pop3Post Office Protocol version 3 (POP3)
111sunrpcRemote Procedure Call (RPC) protocol used for remote command execution, used by Network File System (NFS)
113authAuthentication and identification protocol
115sftpSecure File Transfer Protocol (SFTP) service
117uucp-pathUnix-to-Unix Copy Protocol (UUCP) Path Service
119nntpNetwork News Transfer Protocol (NNTP) for USENET discussion systems
123ntpNetwork Time Protocol (NTP)
137netbios-nsNETBIOS Name Service, used by Samba in Red Hat Enterprise Linux
138netbios-dgmNETBIOS Datagram Service, used by Samba in Red Hat Enterprise Linux
139netbios-ssnNETBIOS Session Service, used by Samba in Red Hat Enterprise Linux
143imapInternet Message Access Protocol (IMAP)
161snmpSimple Network Management Protocol (SNMP)
162snmptrapSNMP Trap
163cmip-manCommon Management Information Protocol (CMIP)
164cmip-agentCommon Management Information Protocol (CMIP) agent
174mailqMAILQ
177xdmcpX Display Manager Control Protocol
178nextstepNeXTStep Window Server
179bgpBorder Gateway Protocol
191prosperoProspero service by Clifford Neuman
194ircInternet Relay Chat (IRC)
199smuxSNMP UNIX Multiplexer
201at-rtmpAppleTalk Routing
202at-nbpAppleTalk Name Binding
204at-echoAppleTalk Echo Service
206at-zisAppleTalk Zone Information
209qmtpQuick Mail Transfer Protocol (QMTP)
210z39.50NISO Z39.50 Database
213ipxInternetwork Packet Exchange (IPX), commonly used datagram protocol in Novell Netware environments
220imap3Internet Message Access Protocol version 3 (IMAP3)
245linkLINK
347fatservFatmen Server
363rsvp_tunnelRSVP Tunnel
369rpc2portmapCoda File System Port Mapper
370codaauth2Coda File System Authentication Service
372ulistprocUNIX Listserv
389ldapLightweight Directory Access Protocol (LDAP)
427svrlocService Location Protocol (SLP)
434mobileip-agentMobile Internet Protocol (IP) Agent
435mobilip-mnMobile Internet Protocol (IP) Manager
443httpsHypertext Transfer Protocol Secure (HTTPS)
444snppSimple Network Paging Protocol
445microsoft-dsServer Message Block (SMB) over TCP/IP
464kpasswdKerberos Password and Key Change Service
468photurisPhoturis Session Key Management Protocol
487saftSimple Asymmetric File Transfer (SAFT) Protocol
488gss-httpGeneric Security Service (GSS) for HTTP
496pim-rp-discRendezvous Point Discovery for Protocol Independent Multicast (PIM)
500isakmpInternet Security Association and Key Management Protocol (ISAKMP)
535iiopInternet Inter-ORB Protocol (IIOP)
538gdomapGNUstep Distributed Object Mapping (GDOMAP)
546dhcpv6-clientDynamic Host Configuration Protocol (DHCP) version 6 Client
547dhcpv6-serverDynamic Host Configuration Protocol (DHCP) version 6 Server
554rtspReal Time Streaming Protocol (RTSP)
563nntpsNetwork News Transfer Protocol over SSL (NNTPS)
565whoamiwhoami
587submissionMail Submission Agent (MSA)
610npmp-localNetwork Peripheral Management Protocol (NPMP) Local/Distributed Queuing System (DQS)
611npmp-guiNetwork Peripheral Management Protocol (NPMP) GUI/Distributed Queuing System (DQS)
612hmmp-indHMMP Indicator/DQS
631ippInternet Printing Protocol (IPP)
636ldapsLightweight Directory Access Protocol over SSL (LDAPS)
674acapApplication Configuration Access Protocol (ACAP)
694ha-clusterHeartbeat service for clusters with high availability
749kerberos-admKerberos version 5 (v5) "kadmin" database administration
750kerberos-ivKerberos version 4 (v4) service
765websterNetwork Dictionary
767phonebookNetwork Phonebook
873rsyncrsync file transfer service
992telnetsTelnet over SSL (TelnetS)
993imapsInternet Message Access Protocol over SSL (IMAPS)
994ircsInternet Relay Chat over SSL (IRCS)
995pop3sPost Office Protocol version 3 over SSL (POPS3)

UNIX-specific Ports (The following ports are specific to UNIX, covering services ranging from email to authentication. The names in square brackets (e.g., [service]) represent the service’s daemon name or its common alias.)
Port Number/Layer Name Description
512/tcp exec Used to authenticate remote execution of processes
512/udp biff[comsat] Asynchronous mail client (biff) and service (comsat)
513/tcp login Remote login (rlogin)
513/udp who[whod] List of logged-in users
514/tcp shell[cmd] Remote shell (rshell) and remote copy (rcp) without login
514/udp syslog UNIX system logging service
515 printer[spooler] Printer (lpr) spooling
517/udp talk Remote talk service and client
518/udp ntalk Network talk (ntalk), remote talk service and client
519 utime[unixtime] UNIX Time Protocol (utime)
520/tcp efs Extended File Name Server (EFS)
520/udp router[route,routed] Routing Information Protocol (RIP)
521 ripng Routing Information Protocol for Internet Protocol version 6 (IPv6)
525 timed[timeserver] Time daemon (timed)
526/tcp tempo[newdate] Tempo
530/tcp courier[rpc] Courier Remote Procedure Call (RPC) Protocol
531/tcp conference[chat] Internet Relay Chat
532 netnews Netnews
533/udp netwall Netwall for emergency broadcast
540/tcp uucp[uucpd] Unix-to-Unix Copy Program service
543/tcp klogin Kerberos version 5 (v5) remote login
544/tcp kshell Kerberos version 5 (v5) remote shell
548 afpovertcp AppleTalk Filing Protocol (AFP) over Transmission Control Protocol (TCP)
556 remotefs[rfs_server,rfs] Brunhoff's Remote File System (RFS)

Registered ports (lists the ports submitted by the network and software communities to IANA to be officially registered in the port number list)
Port Number/Layer Name Description
1080 socks SOCKS network application proxy service
1236 bvcontrol[rmtcfg] Garcilis Packeten remote configuration server
1300 h323hostcallsc H.323 host call security for teleconferencing
1433 ms-sql-s Microsoft SQL Server
1434 ms-sql-m Microsoft SQL Monitor
1494 ica Citrix ICA client
1512 wins Microsoft Windows Internet Name Service (WINS)
1524 ingreslock Ingres Database Management System (DBMS) lock service
1525 prospero-np Non-privileged Prospero
1645 datametrics[old-radius] Datametrics/former RADIUS project
1646 sa-msg-port[oldradacct] sa-msg-port/former radacct project
1649 kermit Kermit file transfer and management service
1701 l2tp[l2f] Layer 2 Tunneling Protocol (L2TP)/Layer 2 Forwarding (L2F)
1718 h323gatedisc H.323 Gatekeeper discovery mechanism
1719 h323gatestat H.323 Gatekeeper status
1720 h323hostcall H.323 host call setup
1758 tftp-mcast Trivial File Transfer Protocol (TFTP) multicast
1759 mtftp Multicast Trivial File Transfer Protocol (MTFTP)
1789 hello Hello router communication port
1812 radius RADIUS authentication and accounting service
1813 radius-acct RADIUS accounting
1911 mtp Starlight Networks Multimedia Transport Protocol (MTP)
1985 hsrp Cisco Hot Standby Router Protocol (HSRP)
1986 licensedaemon Cisco License Manager Daemon
1997 gdp-port Cisco Gateway Discovery Protocol (GDP)
2049 nfs[nfsd] Network File System (NFS)
2102 zephyr-srv Zephyr notification transport and server
2103 zephyr-clt Zephyr serv-hm connection
2104 zephyr-hm Zephyr Host Manager
2401 cvspserver Concurrent Versions System (CVS) client/server operations
2430/tcp venus Venus Cache Manager for Coda File System (codacon port)
2430/udp venus Venus Cache Manager for Coda File System (callback/wbc interface)
2431/tcp venus-se Venus TCP side-effects
2431/udp venus-se Venus UDP side-effects
2432/udp codasrv Coda File System server port
2433/tcp codasrv-se Coda File System TCP side-effects
2433/udp codasrv-se Coda File System UDP SFTP side-effects
2600 hpstgmgr[zebrasrv] HPSTGMGR; Zebra Routing
2601 discp-client[zebra] discp client; Zebra Integrated Shell
2602 discp-server[ripd] discp server; Routing Information Protocol Daemon (ripd)
2603 servicemeter[ripngd] Service Meter; RIP Daemon for IPv6 (ripngd)
2604 nsc-ccs[ospfd] NSC CCS; Open Shortest Path First Daemon (ospfd)
2605nsc-posaNSC POSA; Border Gateway Protocol Daemon (bgpd)
2606netmon[ospf6d]Dell Netmon; OSPF Daemon for IPv6 (ospf6d)
2809corbalocCommon Object Request Broker Architecture (CORBA) Naming Service Locator
3130icpv2Internet Cache Protocol Version 2 (v2); Used by Squid Proxy Cache Server
3306mysqlMySQL Database Service
3346trnsprntproxyTrnsprnt Proxy
4011pxePreboot Execution Environment (PXE) Service
4321rwhoisRemote Whois (rwhois) Service
4444krb524Kerberos Version 5 (v5) to Version 4 (v4) Ticket Translator
5002rfeRadio-Free Ethernet (RFE) Audio Broadcast System
5308cfengineConfiguration Engine (Cfengine)
5999cvsup[CVSup]CVSup File Transfer and Update Tool
6000x11[X]X Window System Service
7000afs3-fileserverAndrew File System (AFS) File Server
7001afs3-callbackAFS Port for Callbacks to Cache Managers
7002afs3-prserverAFS User and Group Database
7003afs3-vlserverAFS Volume Location Database
7004afs3-kaserverAFS Kerberos Authentication Service
7005afs3-volserAFS Volume Management Server
7006afs3-errorsAFS Error Interpretation Service
7007afs3-bosAFS Basic Overseer Process
7008afs3-updateAFS Server-to-Server Updater
7009afs3-rmtsysAFS Remote Cache Manager Service
9876sdSession Director
10080amandaAdvanced Maryland Automatic Network Disk Archiver (Amanda) Backup Service
11371pgpkeyserverPretty Good Privacy (PGP)/GNU Privacy Guard (GPG) Public Key Server
11720h323callsigaltH.323 Call Signaling Alternate
13720bprdVeritas NetBackup Request Daemon (bprd)
13721bpdbmVeritas NetBackup Database Manager (bpdbm)
13722bpjava-msvcVeritas NetBackup Java/Microsoft Visual C++ (MSVC) Protocol
13724vnetdVeritas Network Utility
13782bpcdVeritas NetBackup
13783vopiedVeritas VOPIED Protocol
22273wnn6[wnn4]Kana/Kanji Conversion System
26000quakeQuake (and related) Multiplayer Game Server
26208wnn6-ds 
33434tracerouteTraceroute Network Tracing Tool
Note:
Comments in /etc/services: Port 1236 is registered as "bvcontrol," but it is also used by the Gracilis Packeten Remote Configuration Server. The formal name is listed as the primary name, and unregistered names are listed as aliases.
Comments in /etc/services: Ports 2600 to 2606 are used by the Zebra software package without registration. The registered name is listed as the primary name, and unregistered names used by Zebra are listed as aliases.
Comments in /etc/services: The port is registered as wnn6, but it is also used by the FreeWnn package under the unregistered name "wnn4".

Datagram Delivery Protocol Ports (Displays a list of ports related to the Datagram Delivery Protocol (DDP). DDP is used on AppleTalk networks)
Port Number/Layer Name Description
1/ddp rtmp Routing Table Maintenance Protocol
2/ddp nbp Name Binding Protocol
4/ddp echo AppleTalk Echo Protocol
6/ddp zip Zone Information Protocol

Kerberos (Project Athena/MIT) Ports (A list of ports related to the Kerberos network authentication protocol, marked as v5 for Kerberos version 5 protocol; these ports are not registered with IANA)
Port Number/Layer Name Description
751 kerberos_master Kerberos Authentication
752 passwd_server Kerberos Password (kpasswd) Server
754 krb5_prop Kerberos v5 Slave Propagation
760 krbupdate[kreg] Kerberos Registration
1109 kpop Kerberos Post Office Protocol (KPOP)
2053 knetd Kerberos Demultiplexer
2105 eklogin Kerberos v5 Encrypted Remote Login (rlogin)

Unregistered Ports (These ports may be used by services or protocols installed on your Red Hat Enterprise Linux system, or they are necessary for communication between Red Hat Enterprise Linux and machines running other operating systems.)
Port Number/Layer Name Description
15/tcp netstat Network Status (netstat)
98/tcp linuxconf Linuxconf Linux Management Tool
106 poppassd Post Office Protocol Password Change Daemon (POPPASSD)
465/tcp smtps Simple Mail Transfer Protocol over SSL (SMTPS)
616/tcp gii Gateway Interactive Interface (Routing Daemon)
808 omirr[omirrd] Online Mirroring (Omirr) File Mirroring Service
871/tcp supfileserv Software Upgrade Protocol (SUP) Server
901/tcp swat Samba Web Administration Tool (SWAT)
953 rndc Berkeley Internet Name Domain Version 9 (BIND 9) Remote Name Daemon Configuration Tool
1127 sufiledbg Software Upgrade Protocol (SUP) Debugging
1178/tcp skkserv Simple Kana to Kanji (SKK) Japanese Input Server
1313/tcp xtel French Minitel Text Information System
1529/tcp support[prmsd,gnatsd] GNATS Bug Tracking System
2003/tcp cfinger GNU Finger Service
2150 ninstall Network Installation Service
2988 afbackup afbackup Client-Server Backup System
3128/tcp squid Squid Web Proxy Cache
3455 prsvp RSVP Port
5432 postgres PostgreSQL Database
4557/tcp fax FAX Transfer Service (Old Service)
4559/tcp hylafax HylaFAX Client-Server Protocol (New Service)
5232 sgi-dgl SGI Distributed Graphics Library
5354 noclog NOCOL Network Operations Center Logging Daemon (noclogd)
5355 hostmon NOCOL Network Operations Center Host Monitoring
5680/tcp canna Canna Japanese Character Input Interface
6010/tcp x11-ssh-offset Secure Shell (SSH) X11 Forwarding Offset
6667 ircd Internet Relay Chat Daemon (ircd)
7100/tcp xfs X Font Server (XFS)
7666/tcp tircproxy Tircproxy IRC Proxy Service
8008 http-alt Alternate for Hypertext Transfer Protocol (HTTP)
8080 webcache World Wide Web (WWW) Cache Service
8081 tproxy Transparent Proxy
9100/tcp jetdirect[laserjet,hplj] Hewlett-Packard (HP) JetDirect Network Printing Service
9359 mandelspawn[mandelbrot] Parallel Mandelbrot Generator for X Window System
10081 kamanda Amanda Backup Service using Kerberos
10082/tcp amandaidx Amanda Backup Service
10083/tcp amidxtape Amanda Backup Service
20011 isdnlog Integrated Services Digital Network (ISDN) Logging System
20012 vboxd ISDN Box Daemon (vboxd)
22305/tcp wnn4_Kr kWnn Korean Input System
22289/tcp wnn4_Cn cWnn Chinese Input System
22321/tcp wnn4_Tw tWnn Chinese Input System (Taiwan)
24554 binkp Binkley TCP/IP Fidonet Mail Transfer Daemon
27374 asp Address Resolution Protocol
60177 tfido Ifmail FidoNet Compatible Mail Service
60179 fido FidoNet Email and News Network
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